Answer:
The clear pipe moves at faster rate.
Step-by-step explanation:
The clogged pipe moves at a slower rate because it's all backed up.
In a sentence: The clear pipe moves at a faster rate than the clogged pipe. This is because the clear pipe is not backed up and can move freely, unlike the clogged pipe that doesn't have area to move as fast.
I used this sentence for mine, so I hope this makes sense and helps!